Activation Energy and Catalyst in Chemical Reactions

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Questions and Answers

What is the role of enzymes in chemical reactions?

  • Slowing down chemical reactions
  • Breaking down substrates
  • Speeding up specific chemical reactions (correct)
  • Producing more substrates

Where does the substrate bind to the enzyme during a reaction?

  • Passive location
  • Active site (correct)
  • Inactive location
  • Inactive site

What is the term used for the reactant in biochemical reactions?

  • Enzyme
  • Product
  • Complex
  • Substrate (correct)

What happens to the product after it is formed in an enzyme-catalyzed reaction?

<p>It dissociates and the enzyme is free to bind another substrate (A)</p> Signup and view all the answers

In the context of activation energy, what does Ea represent?

<p>Activation energy of the reaction (D)</p> Signup and view all the answers

What is the main factor that determines the speed of reaction in the Arrhenius equation?

<p>Temperature (D)</p> Signup and view all the answers

What is the minimum energy required to start a chemical reaction called?

<p>Activation energy (C)</p> Signup and view all the answers

Which of the following statements about collision theory is true?

<p>Molecules must collide in the correct orientation with kinetic energy greater than the activation energy for a reaction to occur. (D)</p> Signup and view all the answers

What is the transition state in a chemical reaction?

<p>A high energy, unstable state where the molecules are contorted or deformed. (B)</p> Signup and view all the answers

What is the role of a catalyst in a chemical reaction?

<p>To lower the activation energy of the reaction. (B)</p> Signup and view all the answers

Which of the following statements about catalysts is true?

<p>Catalysts are not consumed during the course of a chemical reaction. (D)</p> Signup and view all the answers

Which of the following energy types must molecules possess to undergo a chemical reaction?

<p>Both kinetic and potential energy (C)</p> Signup and view all the answers

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